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1.1 SYSTEMS ARCHITECTURE - Coggle Diagram

- - - - Holds the memory address of the next instruction to be processed.
    - - Holds the memory address of the instruction or data to be fetched. It is directly connected to main memory but it can only go in one direction.
    - - Holds the data or instruction temporarily after it has been fetched from main memory. It is directly connected to main memory, data and instructions can go to and from main memory.
    - - Special purpose register
      - Directly connected to the ALU. Stores the results of operations completed in the ALU.
  - - - Decodes instructions
      - Sends and recieves control signals to and from other devices in the system.
      - Regulates and controls processor timing using pulses from the system clock.
    - - Carries out logical operations such as, AND, OR and NOT.
      - Shift operations- the bits in a computer word can be shifted less and right.
      - Arithmetic operations such as addition, subtraction, multiplication and division.
    - - Fast but small memory.
      - Stores frequently used instructions or data e.g variables that are being used in a loop.